if c.before != "" { // if defined before callback
			if c.before == "*" && len(sorted) > 0 {
				if curIdx := getRIndex(sorted, c.name); curIdx == -1 {
					sorted = append([]string{c.name}, sorted...)
				}
			} else if sortedIdx := getRIndex(sorted, c.before); sortedIdx != -1 {
				if curIdx := getRIndex(sorted, c.name); curIdx == -1 {
					// if before callback already sorted, append current callback just after it